Switch to vibrate: There is no need to go to Profiles > Advanced. You should be able to simply go to Profiles > Vibrate. If you enable "Homescreen Shortcuts" you can simply tap F for Profiles > V to vibrate and the enter key to enable.Home Screen Shortcuts - BlackBerryFAQ
or, Set your side convenience key to Profiles (Options > Screen/Keyboard > Left or Right side convenience key).